‘redirect_uri’ mismatch

Thanks for reaching out @netsrepublic. So we can ensure you are able to complete Site Kit set up successfully, please share the following:

1. Your Site Health information. You can use this form to share privately if preferred.  
2. Does the same occur if you reset Site Kit first (Tools > Available Tools > Reset Site Kit) and attempt set up once more? I ask as a reset can ensure your site records, including your redirect URL is updated.
3. Have you been able to set up Site Kit on this site previously, maybe from another URL or before migrating to another hosting provider?

Once we have the above we can investigate this further.

Glad to hear it @netsrepublic, many thanks for the update. If you run into any further issues be sure to reach out.